Richardson opted out of the tournament to be with his wife for the birth of his first child.
"We're thrilled to welcome Adam Zampa in RCB colours. He replaces Kane Richardson. Let's #PlayBold Adam Zampa." RCB tweeted on Monday night.
"The RCB family is excited for Kane and his wife who are expecting the birth of their first child and respect his decision to pull out of the tournament," it added.
Zampa joins the likes of Yuzvendra Chahal, Washington Sundar, Moeen Ali and Pawan Negi, strengthening the team's spin attack.
"We are disappointed to not have Kane's skills with us this IPL, as he was certainly on top of his game," RCB team director Mike Hesson said.
"However, once we found out Kane and Nyki's baby was due during the IPL, it's an exciting time, and we were fully supportive of Kane wanting to be at the birth of their first child.
Hesson felt Zampa also gives the side "extra options if conditions suit spin as expected during the tournament."
This will be Zampa's second stint in the IPL as he earlier played for the Rising Pune Supergiant.
The 28-year-old went unsold at the auction last year while Richardson was bought for Rs 4 crore by RCB.
Both Richardson and Zampa are currently in England as part of Australia's squad for the white-ball tour.
The two teams are slated to play three T20Is and as many ODIs between September 4-16.
The 13th edition of IPL was shifted out of India due to the COVID-19 pandemic.
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Bengaluru (PTI): Four people, among them two women, were arrested for running a prostitution racket from rented houses in parts of the city, police said on Monday.
With their arrest, police also rescued four women who were allegedly forced into prostitution, they said.
The arrests were made following tip-offs received by the Central Crime Branch’s Women Protection Unit on different dates, indicating that prostitution activities were being carried out in rented houses located in Padmanabhanagar, RK Layout, Sundarnagar, and NGF Layout, police said.
Based on information provided by informants, raids were conducted at these locations on different dates, they said.
“During the operations, four women involved in prostitution were rescued. In connection with the case, a total of four individuals, among them two women who were allegedly forcing others into prostitution, were taken into custody,” a statement issued by the office of Bengaluru Police Commissioner Seemant Kumar Singh said.
Upon interrogation, the accused allegedly confessed that they contacted men seeking prostitution services over the phone and arranged for them to visit rented houses, where illegal activities were carried out for monetary gain, it said.
Cases have been registered against the accused at Subramanyapura, Jalahalli, and Jnanabharathi police stations, and further investigation is in progress, police added.

Sep 1: Royal Challengers Bangalore has named Australian leg-spinner Adam Zampa as a replacement for his compatriot Kane Richardson, who pulled out of the IPL starting September 19 in the UAE.